Subdir is a Python script for enumerating subdomains using the SecurityTrails API. It allows users to quickly discover subdomains associated with a given domain by leveraging the SecurityTrails API.

1. Prerequisites: Ensure you have Python installed on your system.

2. Permission and Installation:

   • Make the script executable:

     chmod +x subdir
     

   • Move the script to the bin directory (optional, for global usage):

     sudo mv subdir /usr/local/bin/subdir
     

3. Usage:

   • To enumerate subdomains for a domain and save them to a file:

     subdir spaceX.com subdomains.txt
     

4. Configuration Directory:

   • Upon running the script, a folder named .subdirconfig will be created in your home directory. This folder contains a file named config where users can store their SecurityTrails API key for authentication.

• For authentication, users need to provide their SecurityTrails API key. The key can be obtained from the SecurityTrails website.
• The script periodically checks the usage of the SecurityTrails API and displays the usage information after every 5 hours.